ORA-00843，ORA-00849
一：版本信息
操作系统版本：LINUX 6.2
数据库版本：11.2.0.1
二：错误描述
今天在取消关闭某个库的自动内存管理功能(即把memory_max_target，memory_target两个参数设置为0)，后重启数据库报如下错误：
ORA-00843: Parameter not taking MEMORY_MAX_TARGET into account ORA-00849: SGA_TARGET 3305111552 cannot be set to more than MEMORY_MAX_TARGET 0.
三：错误原因及解决方案
1.错误原因：
The problem is caused by the MEMORY_MAX_TARGET parameter explicitly being set to 0. In case AMM should not be used, MEMORY_MAX_TARGET should not be set at all.(摘自ORA-00843, ORA-00849 When Trying To Change SGA_TARGET With MEMORY_MAX_TARGET=0 Being Active (Doc ID 1397761.1))
2.处理方案
通过spfile创建pfile，删除pfile中的memory_max_target=0，memory_target=0两行，再通过修改后的pfile重建spfile，使用新的spfile重启数据库。
##详细信息参见ORA-00843, ORA-00849 When Trying To Change SGA_TARGET With MEMORY_MAX_TARGET=0 Being Active (Doc ID 1397761.1)